{{-- Shared nav-header card with back button + optional action button. Props: $backAction (string, required) : onclick value for back button, e.g. "history.back()" or "window.location='{{ url($url_menu) }}'" $actionLabel (string, optional) : label for the action button (e.g. "Simpan", "Tambah") $actionIcon (string, optional) : FA class for action icon (e.g. "fas fa-floppy-disk") $actionAttr (string, optional) : extra attrs on the action button (e.g. "onclick=\"...\"") $authorizeKey (string, optional): 'add' | 'edit' — key to check on $authorize (leave blank to skip check) --}}